Registered shading cut (3)
I believe the answer is:
hew
'cut' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for hew that I've seen before include "Shape wood, as with an axe" , "Chop or cut with axe" , "Chop or hack at" , "Chop (wood)" , "Carve out of wood or stone" .)